Beware of poisoned images online

This is just a heads up to be careful about image searches online. The last three times that I was asked to help with a malware attack attempt each user had been surfing for images (educational) but got more than what they bargained for. People with criminal intent to poison websites are clever at knowing how to inject code into a website's page. Moreover, I recently read an article that said that the people who write this code are clever enough to make it present itself as "good" when it detects that it's being scanned by an antimalware engine and then go back to being "bad" when the coast is clear.